<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // 成绩统计：作业练习
        let num = prompt('请输入班级总人数');
        let sum = 0;
        for(let i = 1;i<=num;i++){
            let score = prompt(`请输入第${i}个学生的成绩`);
            sum = sum + parseFloat(score);
        }
        alert(`班级总成绩为${sum}`);
        alert(`班级平均成绩为${sum/num}`);

    </script>
</body>
</html>